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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Bound polaron states in GaAs/Ga
1 - X
Al
x
As cylindrical quantum dot under hydrostatic pressure effect
Surface Science, Volume 624, Year 2014
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Description
A theoretical study of the effect of hydrostatic pressure on the binding energy of shallow hydrogenic impurity in a cylindrical quantum dot (QD) using a variational approach within the effective mass approximation is performed. The hydrostatic stress was applied along the QD growth axis. The interactions between the charge carriers (electron and ion) and different phonon modes; confined longitudinal optical (LO) phonon modes, and top-surface (TSO) and side-surface (SSO) phonon modes are incorporated in our calculation. We focus on the effects of the QD sizes, the impurity position, the hydrostatic pressure, and the polaronic correction. Our numerical findings for GaAs/Ga 1 - xAlxAs QD have shown that the binding energy of the shallow donor impurity with and without total phonon influence decays as the impurity moves away from the center to the edge of the QD. The contribution of LO phonon decreases while that of the SO phonon increases as the impurity shifts away from the QD center. However, the quantity of SO phonon correction to the binding energy is quite small and has a relatively unimportant role when we consider the binding energy of an impurity placed in the cylinder center. Furthermore, both the binding energy and its polaronic corrections due to the LO phonon and the SO phonon modes increase linearly with increasing stress and present a qualitative agreement with those obtained in literature. © 2014 Elsevier B.V.
Authors & Co-Authors
El-Moussaouy, Abdelaaziz
Morocco, Oujda
Université Mohammed Premier Oujda
Morocco, Oujda
Centre Régional Des Métiers de L'education et de la Formation
Ouchani, N.
Morocco, Fes
Centre Régional Des Métiers de L'education et de la Formation
El Hassouani, Youssef
Morocco, Meknes
Université Moulay Ismaïl
Benami, Abdellah
Morocco, Meknes
Université Moulay Ismaïl
Statistics
Citations: 14
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1016/j.susc.2014.02.005
ISSN:
00396028
Study Design
Cohort Study
Study Approach
Qualitative